What is Lexer and parser?

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Tags

1. #formed
2. #lexers
3. #program
4. #produced
5. #parsers
6. #further
7. #parser
8. #grammatical
9. #lexer
10. #sentences
11. #proper
12. #analysis
13. #tries
14. #takes
15. #level
16. #tokens
17. #performs
18. #lexical
19. #software
20. #determine